Chain grate



Nov; 15, 1927.

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avwemtoz 351 445 Sum/1444 JWMrMM/ pen UNITED STATESPATENT orifice.

. JOHN WILLIAM XVRAY, OF LONDON, ENGLAND, ASSIGNOBTO INTERlTATIONAL COII- BUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A COREORATION OF DELAWARE.

Application filed March 12, 1927, Serial No. 17

This invention relates to travelling grates of the endless chain type.

It is the primary ob] to provide a chain grate of such character that the liner particles of fuel are not lost by sitting through air spaces of: the grate, but are held on the surface thereof and burned as the grate moves'through the combustion chamber.

A further object of my invention lies in the provision of means forcatching and reaining such small fuel and dust as may hapto fall through the air spaces and discharging it at the end of the grate. I

A further object lies in the provision of means for dislodgirig and dischar ing any clinkers which may adhere to the grate.

Another object of my invention is the provision of a grate wherein the grate bars are pivoted to carriers and lie one against the other in the upper run of the grate but fall away and travel free of each other in the lower run.

A further object is' the provision of means for mounting the grate bars which permit of ready removal and replacement of any of the grate bars or groups thereof.

These, together with such other objects as may hereinafter appear, or are incident to my invention, I obtain by means of a construction which I have illustrated in preierred form in the accompanying drawings,

wherein- Fig. 1 is a fragmentary longitudinal section of a portion of the grate showing diagrammatically the rear drum towards which the upper run of the grate travels and is taken substantially on the line 1-1 of Fig. 3.

Fig. 2 is a. longitudinal section similar to Fig. 1 showing a portion of the upper run of the grate, some of the grate bars being shown in elevation and'others in section.

Fig. 3 is a transverse section oi the grate with the grate bars appearing in elevation, the right hand half being taken on the line 3*?) oi. Fig. 'l, and the left hand. end being taken on the line 3'5 of Fig. 1.

Fig. 4cis a plan view of a portion of the grate with certain of the parts omitted for the sake of clarity.

Figs. 5 and 6 are detail views showing a modification.

Fi 7 is a diagrammatic view showing the ect of my invention CHAIN GRA'rE.

4,937; and in Great Britain Novemiicr 6, 1925.

relation of the grate to the drum and supports. i i i i Referring now to Figs. 1 and 4, it will be seen that I have shown a grate comprising; two sets of grate bars 5. Generally the width of the grate is such that a bar extending the whole of the width would he too heavy and according to the invention there maybe sereral bars in the widtln carried by a series of chains in nun'iher normally one or more than the number of liar-sin the width oi the grate- 1 i In the construction shown in Figs. 1 to l the grate bar 5 has pivot 6 at eachend which. e ages in a c vity 7 in a grate bar carrier or side casting 8. Theside castings i 8 are. securedto carrying links 10 of the chain A by means of bolts 9. The links 10 are connected by means of smaller links l0" thus forming an endless chainv of alternate carrying and connecting links. o

The links 10 also carry the spindles 21 encircled by the sleeves 20. Rollers '12 are mounted on the sleeves .QOand the chain is supported able supports over the drum 13.

The preferred shape of the grate bars 5 will be appreciated from the drawings. In the upper run of the chain they rest against each other at an angle of about the downward slope being in the direction of travel. Suitable projections 18 prevent actual contact through the whole of the length of the bar, affording an air space between bars.

The pockets 19, formed by turning up the lower edge of the bar 5, receive any fine fuel or dust which may fall through the air spaces and such tine material is discharged as the grate bars reverse their position in travelling over the drum 13, as will be seen in Fig. l.

As the chain A leaves the upper run or the grate the bars turn on their pivots dis charging the ash and any material collected in the pockets 19. This movement of the grate bars also dislodges any clinkers which may have also discharged.

Figs. a and 5 illustrate a modified form of side casting which instead of having a number of cavities 7 has a single continuous by these roller'swhich. run on suit- 1 11 (see Fig. 2 and Fig.7) and been formed and such clinker-s are slot 15. In this construction the pivot of each grate bar 5 has a collar 16, the dian1- oter'of which issuch that therewill be a little play between bars. Except for this collar the bar is otherwise the same as the bar 5 shown in Figs. 1 to 4.

An opening l7into the slot 15 permits the pivots being slid successively into or out of the slot. order to do this, the casting must be tilted out of its normal positionto clear the connecting links 10 enough to permit the pivots to he slid in. between the lowersurface of the casting and the connecting link. This clearance is not sulficient innormal-operation to permit accidental disengagement of a pivot;

Owing to the louvre-like formation of the grate it will be seen that the most of the fine fuel will remain on the surface of the grate instead of falling through the air spaces between bars and that any material which does fall through will he caught and discharged at the end of the grate.

1. A travelling. grate of the endless chain type having-a plurality of cooperating endless chains, grate. bar carriers mounted on said chains, transversely extending grate bars pivoted at each end to one of said carriers, each grate bar having a general upward and forwardslope when in fuel supporting position, and also having a pocket openingupward at its rearward lower edge when in suchposition.

2. A travelling grate of the endless chain type having an endless chain construction, grate bar carriers carried by the endless chain construction, a plurality of trans- It will be understood that in versely extending grate bars pivoted to each carrier, the bars on each carrier lying one against the other and one bar on each carrier lying. against a bar of an adjacent carrier in the upper run of the grate, all of the bars hanging free in the lower run of said chains, transversely extending grate hars pivoted abeach end to one end of said carriers, each grate bar lying in a sloping position in the upper run of'the grate and also having a pocket at its lower edge adapted to catch small insuch position. I

5. A travelling grate of the endless chain type having a plurality of cooperatingendless chains, grate bar carriers mounted on said chains, transversely extending substantially flat grate bars pivoted at each end fuel and dust when to one of said carriers and lying in a sloping position in the upper run of the grate and each grate bar having a pocket at its lower edge adapted to. catch small fuel and dust when in such position.

In testimony whereof- I have hereunto signed my name.

JOHN" \VILLIAM WRAY.

Certificate of Correction,

Patent No. 1,649,557. Granted November 15, 1927, to JOHN WILLIAM WRAY.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 59, claim 4, strike out the Word end, second occurrence; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 13th day of December, A. D. 192-7.

[SEAL] M. J. MOORE,

Acting Oowwm'ssz'oner of Patents. 

